KR970012302A - Magnetic recording apparatus and method - Google Patents

Abstract

The present invention discloses a magnetic recording apparatus and a magnetic recording method.

The present invention relates to a digital information recording and / or reproducing apparatus, which comprises a fixed driving unit for supplying positive and negative signals to be inverted corresponding to digital information, a recording current generating unit for generating a recording current in response to positive and negative polarity signals, A push-pull amplifier for supplying a push-pull amplifier to the head, and a current switching element for controlling a positive and a negative signal to supply a current to the push-pull amplifier to record a digital signal on the magnetic recording medium based on the transient pulse current, It is possible to improve the rising characteristic of the head current, and at the same time, it is suitable for a small size and a small power type.

Further, according to the present invention, the fluctuation of the instantaneous value amplitude of the write current necessarily caused by the use of the rotary transformer can be compensated, so that the recording current rise characteristic at the time of switching the write current polarity can be kept very stable.

Description

Magnetic recording apparatus and method

Since this is a trivial issue, I did not include the contents of the text.

FIG. 13 is a schematic block diagram of a digital magnetic recording apparatus to which the present invention is applied; FIG.

FIG. 14 is a detailed block diagram according to one embodiment of the write amplifier shown in FIG. 13,

FIG. 15 is a principle configuration diagram of the write amplifier shown in FIG. 14; FIG.

16 is a voltage and current waveform diagram of each section of the write amplifier shown in FIG. 15,

17 is a detailed circuit diagram of the write amplifier shown in FIG. 15,

Figs. 18A to 18C are waveform diagrams of the input voltage signal and the head current supplied to the write amplifier shown in Fig. 17,

19A is a circuit state diagram immediately before current polarity reversal switching in a flyback write amplifier, and FIG. 19B is a diagram showing initial values of voltage and current of each part when t = 0;

20A and 20B are diagrams for explaining the load impedance of the head portion and the equivalent circuit,

FIG. 21A is a circuit state view showing a change in voltage and current at each corner of the circuit for explaining the transient phenomenon throughout the current polarity reversal switching in the flyback write amplifier, and FIG. 21B is a voltage and current ripple diagram at this time.

FIG. 22A is a circuit state diagram showing changes in voltage and current of a circuit for explaining a transient phenomenon in the latter half of current polarity reversal switching in a flyback write amplifier, and FIG. 22B is a voltage and current waveform diagram at this time.

FIG. 23A is a circuit diagram showing a change in voltage and current at the corner of the damper diode when a pair of damper diodes are added to the circuit shown in FIG. 22A, and FIG. 23B is a voltage and current ripple diagram at this time.

24A to 24C are waveforms of input and output signals of a write amplifier mounted in a rotary cylinder,

25 is an equivalent circuit diagram of a recorder,

Figures 26A-26E are variations of the sub-currents of the circuit shown in Figure 25,

27 is a time variation diagram of the energy sum term accumulated in the load impedance of the recorder;

28A to 28C are diagrams showing changes in the amplitude value of the flyback pulse corresponding to the input bit length,

Figure 29 is a block diagram according to another embodiment of the write amplifier shown in Figure 13;

Figure 30 is a detailed circuit diagram of the write amplifier shown in Figure 29;

31A to 31E are waveform diagrams of input / output signals of the compensation signal forming unit shown in FIG. 29,

FIG. 32 is a diagram showing compensation current calculations for understanding the stabilization of the write current switching characteristic. FIG.

Claims (19)

1. An apparatus for recording a digital signal by magnetizing a magnetic recording medium by interposing a recording current corresponding to digital information in a magnetic head, the apparatus comprising: A shaping driver for supplying positive and negative signals whose polarities are inverted corresponding to the digital information; A push-pull means for generating a write current in response to the positive and negative polarity signals, generating a transient pulse current during polarity switching of the write current, and supplying the transient pulse current to the magnetic head; And a current switching means for switching a current flowing in the push-pull means in response to the positive and negative polarity signals, wherein the digital signal is recorded on the magnetic recording medium on the basis of the transient Fell- . The magnetic recording apparatus according to claim 1, further comprising: constant current control means for controlling the current signal supplied to the push-pull means to be constant at all times. The push-pull circuit according to claim 1, further comprising: compensation signal forming means for forming a compensation signal corresponding to a variation of the instantaneous value of the write current amplitude of the push-pull means; And a constant current control means for controlling the constant current. An apparatus for recording a digital signal by magnetizing a magnetic recording medium by supplying a recording current corresponding to digital information to the magnetic head, the apparatus comprising: A shaping driver for supplying positive and negative current signals whose polarities are inverted corresponding to the digital information; A pair of switching means for switching the positive and negative polarity current signals; A first amplifying element for generating a write current corresponding to an all-round signal transmitted by one of the pair of switching means, generating a transient pulse current upon switching of the write current polarity and supplying the transient pulse current to the magnetic head; A second amplifying element for generating a write current corresponding to the current signal switched by the other one of the pair of switching means and generating a constant pulse current upon switching of the write current polarity and supplying the same to the magnetic head, And a constant current element for controlling a constant current to flow through the second amplifying element to flow the transient pulse current to the magnetic head to record a digital signal on the magnetic recording medium. 5. The semiconductor device according to claim 4, wherein one end is connected between one of the first pair of switching means and the first amplifying element, the other end is connected to a power source, and one end is connected to another one of the pair of switching means Further comprising a second damper element connected between the second amplifying element and the other end connected to the power source so that the transient pulse current is quickly converged to a steady-state current value by the first and second damper elements Magnetic recording device. An apparatus for recording a digital signal by magnetizing a magnetic recording medium by supplying a recording current corresponding to digital information to a magnetic head through a rotary transformer, the apparatus comprising: A shaping driver for supplying positive and negative current signals whose polarities are inverted corresponding to the digital information; A pair of switching means for switching the positive and negative polarity current signals; A first amplifying element for generating a write current corresponding to a current signal switched by one of the pair of switching means, generating a transient pulse current at the time of switching the write current polarity and supplying it to the magnetic head; A second amplifying element for generating a write current corresponding to a current signal switched by the other one of the first pair of switching means and generating a transient pulse current at the time of switching the write current polarity to supply to the magnetic head; A generator for generating a compensation signal in the form of a voltage signal in accordance with the variation of the amplitude of the instantaneous value of the write current generated because the write current is supplied to the magnetic head via the rotary transformer; And a constant current control element for causing the instantaneous value of the write current to be constant in response to the compensation signal to flow the transient pulse current to the magnetic head to record the digital signal on the magnetic recording medium. 7. The semiconductor memory device according to claim 6, wherein one end is connected between one of the pair of switching means and the first amplifying element, the other end is connected to a power source, and one end is connected to the other one of the pair of switching means And a second damper element connected between the second amplifying element and the other end connected to the power source so that the transient pulse current quickly converges to the steady-state current value by the first and second damper elements. Device. An apparatus for recording a digital signal by magnetizing a magnetic recording medium by supplying a recording current corresponding to digital information to a magnetic head, the apparatus comprising: a shaping driver for supplying a positive or negative polarity signal whose polarity is inverted corresponding to the digital information; A first complementary semiconductor element for issuing a write current in response to the positive polarity signal, generating a transient pulse current upon switching of write current polarity, and supplying the generated pulse current to the magnetic head; A second complementary semiconductor element connected in parallel to generate a write current in response to the negative polarity signal and generating a transient pulse current upon switching of write current polarity to supply the write current to the magnetic head, And a constant current control element connected in common to the complementary semiconductor elements and the first and second complementary semiconductor elements to control the constant current to always flow through the first and second complementary semiconductor elements, And a digital signal is recorded on the medium. 9. The semiconductor device according to claim 8, further comprising: a first damper element having one end connected between the first complementary semiconductor elements and the other end connected to a power source; And a second damper element having one end connected between the second complementary semiconductor element and the other end connected to the power source, so that the transient pulse current quickly converges to the steady-state current value by the first and second damper elements Magnetic recording medium. An apparatus for recording a digital signal by magnetizing a magnetic recording medium by supplying a recording current corresponding to digital information to a magnetic head through a rotary transformer, the apparatus comprising: A shaping driver for supplying a positive or negative polarity signal whose polarity is inverted corresponding to the digital information; A first complementary semiconductor element which generates a write current in response to the positive polarity signal and generates a transient pulse current when the write current polarity is switched and supplies the generated pulse current to the magnetic head; A second complementary semiconductor element which is connected in parallel with the first complementary semiconductor element and generates a write current in response to the negative polarity signal and generates a transient pulse current during write current polarity switching to supply the pulse current to the magnetic head; A generator for generating a compensation signal in the form of a voltage signal in accordance with the variation of the amplitude of the instantaneous value of the write current generated because the write current is supplied to the magnetic head via the rotary transformer; And a constant current control element connected in common to the first and second complementary semiconductor elements so that the instantaneous value of the write current is constant in response to the compensation signal to record a digital signal on the magnetic recording medium based on the transient pulse current Magnetic recording medium. 11. The semiconductor device according to claim 10, further comprising: a first damper element having one end connected between the first complementary semiconductor elements and the other end connected to a power source; And a second damper element having one end connected between the second complementary semiconductor element and the other end connected to the power source, so that the transient pulse current is quickly converged to the pre-set current value by the first and second damper elements. Magnetic recording medium. An apparatus for recording and reproducing a digital signal by magnetizing a magnetic recording medium by supplying a recording current corresponding to the digital information to the magnetic head and reproducing the digital signal, A driving unit; First and second power supplies for supplying predetermined first and second DC voltages; A base connected to the first power supply, the emitter electrically connected to the first power supply, and the second pnp transistor electrically connected to the negative power supply; A base connected to the fixed driving unit, an emitter coupled to the first power supply, and a second pnp transistor rendered conductive according to the positive polarity signal; And a collector connected to the collector of the 1pnp transistor, for generating a rising pulse current at the instant when the first pnp transistor is cut off and supplying the write pulse to the magnetic head as a write current; A second npn transistor coupled to the fixed driving unit, a collector coupled to the collector of the second pnp transistor, for generating a rising pulse current at the instant when the second pnp transistor is cut off and supplying the writing pulse to the magnetic head; A base connected to the power source, a collector connected to the emitters of the first and second npn transistors in common, and an emitter connected to the second power source, the third npn transistor having a variable resistor for current control connected thereto, And a digital signal is recorded on the magnetic recording medium based on the information. 13. The method of claim 12, wherein the first to third npn transistors are short-circuited at the time of polarity switching of the write current based on the magnitude of the power supply voltage to rapidly apply a voltage corresponding to the power source to the magnetic head, Thereby generating an improved transient pulse current. 13. The semiconductor memory device according to claim 12, further comprising: a first damper diode having one end connected to a common collector of the first pnp transistor and the first npn transistor and the other end connected to a first power supply; And a second damper diode having one end belonging to a common collector of the second pnp transistor and the second npn transistor and the other end connected to a first power source so that the first and second damper diodes raise the rising pulse current rapidly And converges to a normal current value. There is provided an apparatus for recording a digital signal by magnetizing a magnetic recording medium by supplying a recording current corresponding to digital information to a magnetic head through a rotary transformer, the apparatus comprising: means for supplying a positive or negative polarity signal having a polarity reversed corresponding to the digital information; First and second power supplies for supplying predetermined first and second DC voltages to the driving unit; A first pnp transistor having a base coupled to the fixed driving unit and an emitter coupled to the first power source and conducting in accordance with the negative polarity signal; A base connected to the fixed driving unit, an emitter coupled to the first power supply, and a second pnp transistor rendered conductive according to the positive polarity signal; A first pnp transistor coupled to the fixed driving unit, a collector coupled to the collector of the first pnp transistor, for generating a rising pulse current at the instant when the first pnp transistor is cut off and supplying the writing current to the magnetic head; And a second npn transistor which is coupled to the collector of the second pnp transistor and generates a rising pulse current at the instant when the second pnp transistor is cut off and supplies the write current to the magnetic head, ; A comparator connected to each of the collectors of the first and second npn transistors for comparing the fluctuation of the amplitude of the instantaneous value of the write current to be supplied to the magnetic head via the rotary transformer with a preset reference value; An integrator and a base for integrating an output of the comparator to generate a compensation signal in the form of a voltage signal are connected to an output terminal of the integrator, a collector is commonly connected to the emitters of the first and second npn transistors, And a third npn transistor to which a variable current controlling variable resistor is connected to record a digital signal on the magnetic recording medium based on the rising pulse current. 16. The method of claim 15, wherein, when the write current is inverted based on the magnitude of the first and second DC voltages, the first to third npn transistors are short-circuited to apply a voltage corresponding to the entire power source to the magnetic head, And generates a transient pulse current with an improved current rising characteristic. 16. The transistor of claim 15, wherein the first npn transistor is connected to the common collector of the first npn transistor, the other end of the first damper diode is connected to the first power supply, and the other end is connected to the common collector of the second npn transistor and the second npn transistor And a second damper diode connected at the other end to the first power source, so that the rising pulse train converges quickly to the steady-state current value by the first and second damper diodes. 1. A magnetic recording method for recording a digital signal by magnetizing a magnetic body of a magnetic recording medium by a rising recording current in digital information supplied to a magnetic head, the magnetic recording method comprising: Generating a positive or negative polarity signal whose polarity is inverted corresponding to the digital information; And generating a write current corresponding to the positive and negative polarity signals, generating an excessive pulse current at the time of polarity switching of the write current and supplying the same to the magnetic head, And recording the digital signal on a medium. 19. The method of claim 18, further comprising: generating a compensation signal corresponding to a variation in the instantaneous amplitude of the write current; and controlling the instantaneous value of the write current to be constant in response to the compensation signal Recording method. ※ Note: It is disclosed by the contents of the first application.